Mercurial > gemma
view pkg/models/intservices.go @ 4606:dfe9cde6a20c geoserver_sql_views
Reflect database model changes for SQL views in backend
In principle, we could use many datasources with different database
schemas, but this would imply changing GeoServer initialization,
service filtering, endpoints and eventually more. Since we do not need
it, just hard-code the schema name as a constant.
author | Tom Gottfried <tom@intevation.de> |
---|---|
date | Thu, 05 Sep 2019 12:23:31 +0200 |
parents | cabf4789e02b |
children | b5aa1eb83bb0 |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2018 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> // * Tom Gottfried <tom.gottfried@intevation.de> package models import ( "context" "database/sql" "log" "net/http" "sync" "gemma.intevation.de/gemma/pkg/auth" "gemma.intevation.de/gemma/pkg/config" ) const DatabaseScheme = "waterway" type IntEntry struct { Schema string `json:"schema"` Name string `json:"name"` SQL *string `json:"sql"` Style bool `json:"style"` WMS bool `json:"wms"` WFS bool `json:"wfs"` } type IntServices struct { entries []IntEntry mu sync.Mutex } const ( selectServicesSQL = ` SELECT schema, name, view_def, style IS NOT NULL, as_wms, as_wfs FROM sys_admin.published_services WHERE schema = $1 ORDER by name` selectStyleSQL = ` SELECT XMLSERIALIZE(DOCUMENT style AS text) FROM sys_admin.published_services WHERE name = $1 AND schema = $2` updateStyleSQL = ` UPDATE sys_admin.published_services SET style = XMLPARSE(DOCUMENT $1) WHERE name = $2 AND schema = $3` ) var InternalServices = &IntServices{} func (e *IntEntry) LoadStyle() (string, error) { var style string ctx := context.Background() err := auth.RunAs(ctx, "sys_admin", func(conn *sql.Conn) error { return conn.QueryRowContext( ctx, selectStyleSQL, e.Name, e.Schema).Scan(&style) }) return style, err } func UpdateInternalStyle(req *http.Request, name, style string) error { return auth.RunAsSessionUser(req, func(conn *sql.Conn) error { _, err := conn.ExecContext( req.Context(), updateStyleSQL, style, name, DatabaseScheme) if err == nil { InternalServices.Invalidate() } return err }) } func (ps *IntServices) Find(name string) (string, bool) { ps.mu.Lock() defer ps.mu.Unlock() if ps.entries == nil { if err := ps.load(); err != nil { log.Printf("error: %v\n", err) return "", false } } if ps.has(name) { return config.GeoServerURL() + "/" + name, true } return "", false } func (ps *IntServices) has(service string) bool { var check func(*IntEntry) bool switch service { case "wms": check = func(e *IntEntry) bool { return e.WMS } case "wfs": check = func(e *IntEntry) bool { return e.WFS } default: return false } for i := range ps.entries { if check(&ps.entries[i]) { return true } } return false } func (ps *IntServices) load() error { // make empty slice to prevent retry if slice is empty. ps.entries = []IntEntry{} ctx := context.Background() return auth.RunAs(ctx, "sys_admin", func(conn *sql.Conn) error { rows, err := conn.QueryContext( ctx, selectServicesSQL, DatabaseScheme) if err != nil { return err } defer rows.Close() for rows.Next() { var entry IntEntry if err := rows.Scan( &entry.Schema, &entry.Name, &entry.SQL, &entry.Style, &entry.WMS, &entry.WFS, ); err != nil { return err } ps.entries = append(ps.entries, entry) } return rows.Err() }) } func (ps *IntServices) Invalidate() { ps.mu.Lock() ps.entries = nil ps.mu.Unlock() } func InternalAll(IntEntry) bool { return true } func IntWMS(entry IntEntry) bool { return entry.WMS } func IntWFS(entry IntEntry) bool { return entry.WFS } func IntSQLView(entry IntEntry) bool { return entry.SQL != nil } func IntWithStyle(entry IntEntry) bool { return entry.Style } func IntByName(name string) func(IntEntry) bool { return func(entry IntEntry) bool { return entry.Name == name } } func IntAnd(accept ...func(IntEntry) bool) func(IntEntry) bool { return func(entry IntEntry) bool { for _, a := range accept { if !a(entry) { return false } } return true } } func (ps *IntServices) Filter(accept func(IntEntry) bool) []IntEntry { ps.mu.Lock() defer ps.mu.Unlock() if ps.entries == nil { if err := ps.load(); err != nil { log.Printf("error: %v\n", err) return nil } } pe := make([]IntEntry, 0, len(ps.entries)) for _, e := range ps.entries { if accept(e) { pe = append(pe, e) } } return pe }